The Extinction Vortex

The extinction vortex

A) is what happens as a population decreases and becomes more vulnerable to extinction from a variety of causes.
B) begins when one species in an ecosystem goes extinct and other species follow.
C) is what happens when competing species fight over a single niche, often driving both species to extinction.
D) is a spiral of events that occur once a species has become overcrowded through excess reproduction.

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